Float chamber of carburetors



Dec. 30, 1924. 1,521,507

' A. COX

FLOAT CHAMBER OF CARBURETORS Filed Jan. 13, 1922 Patented Dec. 36, i924.

LEELWZ career crates.

ARTHUR (30X, OF OLTUN. NEAR BIRMINGHAM, ENGLAND.

FLOAT CHAMBER- Ol CAR-BURE-TORS.

Application filed January 13, 1922.

To all whom it may concern:

Be it known that ARTHUR Cox, subjectof the King of Great Britain,residing at Harlech, Warwick Road, Olton, near Birmingham, England,engineer, has invented certain new and useful Improvements in the FloatChambers of Carburetors, of which the following is a specification.

This invention has reference to a carburetor float-chamber that iscombined or provided with self-contained means for filtering out andintercepting water and other foreign matter from the fuel during thepassage of the latter from the inletvalve of the float-chamber to theoutlet thereof; the said invention consisting in the improvedconstruction hereinafter described, which is principally applicable tofloatchambers of the bottom-feed type although it may also, by suitablemodification in one of the parts, be also applied to chambers of thetop-feed type.

The improved construction is represented, in its application to abottom-feed floatchamber, in the accompanying drawing, in which Figure 1is a sectional view of the complete float-chamber and filter unit, and

Figures 2 to 6 inclusive are detailed views of the component parts ofthe device, the figures showing respectively the combined filtering cupand water collecting sump, the needle valve, the fioat, and the fuelinlet plug or union.

In the filtering float-chamber unit shown in these'figures, the body aof the float chamber is of substantially the ordinary bottom-feedconstruction, in that it has a fuel-inlet passage a formed in the centreof its bottom, and an outlet branch (L that leads to the carburetor; themouth or open end of this body being provided with the usual detachablecover I) that is normally secured in the position shown in Figure l byany convenient means.

Mounted inside this body a is a filtering cup 0, which is centrallyattached at its base to a platform or elevated portion a of the saidbody; this cup being of suitable dimensions for containing the float dof the fuel-inlet valve and of such a height that its mouth or openupper end is normally closed by the cover I), which latter may be facedon its underside with felt or the like to Serial No. 529,041.

make a fuel-tight joint over the said mouth of the cup.

The walls of the cup are formed, at some distance above the bottom ofthe latter, with a system of outlet-apertures 6 filled or covered withwire-gauze or other filtering medium through which the fuel isconstrained to pass in proceeding to the outletbranch 0, and is therebysubjected to a filtering action, the unperforated portion of the cupbelow the said apertures 6 serving as a collecting sump for water or thelike that is filtered out of the fuel by the aperture-fillings orcovering.

In the case of a bottomfeed chamber as illustrated, the cup is securedto the bottom platform of the chamber-body by a screwed plug or union 7in which is formed, the fuel inlet passage 7" and a seat for the needleof the inlet valve, whilst above the said seat and leading into theinside of the cup in a plane below the filtering apertures, the saidplug is also formed with radial delivery passages 7.

Thus fuel passing the valve seating of the bottom-feed plug enters thecup at the bot tom of the latter, and can only proceed to the outlet ofthe chamber by way of the apertures e where the fuel is subjected toeffective filtering before leaving the cup, whilst owing to the elevateddisposition of the said apertures in relation to the infiowpassages P,the filtering device provides a bottom sump of such capacity as willintercept and retain a considerable volume of filtered-out water or thelike before necessitating removal for cleaning.

The cup can be readily disconnected and removed for cleansing or similarpurposes by merely unscrewing the union-plug 7 after having firstremoved the cover 6 and withdrawing the float by way of the mouth of thesaid cup.

The method of mounting and securing the filter-cup within the body ofthe floatchamber may also be applied to chambers of the top-feed typewhere the inlet-valve seating is formed in the cover; the connection ofthe base of the cup to the bottom of the chamber-body being made, inthis case, by a solid or plain plug or screwed union.

Having described my invention, what I claim and desire to secure byLetters Patent 1. A fuel filtering device for carburetors,

comprising a float chamber-having inlet and outlet openings, a combinedfiltering cup and Water collecting sump located in the float chamberbetween the inlet and outlet openings, and a combined clamping and fuelinlet plug for retaining said filtering cup within the float chamber. pV

2. A fuel filtering device for carburetors, comprising a float chamberhaving inlet and outlet openings, a combined filtering cup and Watercollecting sump located in the wfloat chamberbetween the inlet andoutlet openings and havingfiltering apertures, and a combined fuel inletand clamping plug engaging the base of said cup and retaining saidfiltering cup Within the float chamber. V

3., A fuel filtering device for carburetors, comprising a float chamberhaving inlet and outletopenings, a combined filtering cup andWater'co'llecting sump. located in the float chambervbetWeen the inletand outlet openings and having filtering apertures and an inlet opening,and a combined clamping and fuel admission plug inserted Within theinlet opening of the cup for retaining said cup Within the float chamberand admitting fuel thereto.

4. A fuel filterin device for carburetors, comprising a float camberhaving inlet and outlet openings; a combined filtering cup andWater collecting sump located Within the float chamber; and'a combinedclamping and fueladmission plug for retaining said filtering cup Withinthe float chamber and admitting fuel thereto, said cup having filteringoutlets through the Walls of the same above the inlet and through Whichthe fuel must flow to reach the outlet from th float chamber.

5. A fuel filteringdevice for carburetors, comprising a. float chamberhaving an outopening of the float chamber for retaining said cup Withinthe float chamber and adapted to admit. fuel into the cup in a planebelow the. filtering apertures of said cup.

In testimony whereof I hereunto afli m signature. 1 r v V AR-THUR cox;

